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Commitments and Contingencies (Tables)
12 Months Ended
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments for Non-Cancellable Operating Leases

The following are future minimum lease payments for non-cancellable operating leases having a remaining term in excess of one year at 31 March 2017:

 

Years ending 31 March (Millions of US dollars):        

2018

     16.0    

2019

     13.0    

2020

     10.6    

2021

     7.2    

2022

     6.7    

Thereafter

     17.8    
  

 

 

 

Total

     $       71.3